Horizontal hydraulic extrusion presses,including tube presses



HORST-HANS GROOS 3,514,987

HORIZONTAL HYDRAULIC EXTRUSION PRESSES, INCLUDING TUBE PRESSES June 2, 1970 Filed Sept. 13. 1967 Mk QN N NM t wk TZ TJ R N i W m. v w y a m M B United States Patent 3,514,987 HORIZONTAL HYDRAULIC EXTRUSION PRESSES, INCLUDING TUBE PRESSES Horst-Hans Groos, Metzkausen, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany,

a German company Filed Sept. 13, 1967, Ser. No. 667,544 Int. Cl. B21c 23/08 U.S. Cl. 72--265 3 Claims ABSTRACT OF THE DISCLOSURE A horizontal four-column extrusion press with four extrusion cylinders arranged between the columns and 'with container-displacing means behind the cylinder crossbeam, container-displacing rods extending beside a cylinder crossbeam, two opposite extrusion cylinders being of such dimensions as to accommodate displacing rods between each of them and the adjacent columns, and the other two opposite extrusion cylinders being of large size, occupying the space between two columns, and furnishing a larger share of the power required.

In a tube-extrusion press, piercing means is arranged behind the cylinder crossbeam, and stationary crossbars carrying cylinders for pressing the container against the die are arranged behind the piercing-cylinder crossbar.

This invention relates to horizontal hydraulic extrusion presses, including tube presses, particularly those of relatively high power output, of four-column construction, with four extrusion cylinders arranged between the columns, and with container-displacing means located behind the cylinder crossbeam.

In all tube presses and other extrusion presses, the size of the billet-container, and therefore, to allow for the exchangeability of the billet-container, the distance between the columns or anchoring rods, is determined by the size of the billet to be extruded, which is dependent upon the extrusion force. In the case of large presses, a further determining factor for the distance between the columns may be, whether the extrusion force is applied by only one extrusion cylinder, located in the aXis of the press, or jointly by a number of cylinders, since the distance between the columns is decisively fixed by the magnitude of the external cylinder diameter.

The billet-container of large presses is frequently moved along the axis of the press by displacing cylinders mounted on the bolster, by way of corresponding displacement rodding. The cylinders, pipe lines and rodding required for this purpose do however increase the difficulty of providing for the good accessibility of the tools of the press. The devices for displacing the billet-container have therefore also often been shifted onto or behind the cylinder crossbeam.

In very large presses, however, particularly those with a plurality of extrusion cylinders, it is difficult to guide the container-displacing rodding on or through the cylinder crossbeam, and also to take up appropriately the forces that arise upon the displacement of the billet-container. The cylinder crossbeam, in an arrangement with four extrusion cylinders and with a four-column construction, must under some circumstances, on grounds of transport or of manufacture, be made in a plurality of parts. Thus it may for instance consist of four crossbars forming a square, the adjacent ends of each two crossbars being associated with a column. Midway between the columns, and therefore at the middle of each crossbar, an extrusion cylinder may be arranged. The passing of the displacement rods of the billet-container through such a crossbar, or even through a one-part cylinder crossbeam, as well as the supporting of the forces arising from the displacement cyl- Patented June 2, 1970 inders of the container, however, gives rise to difficulties. From the resulting effort to kee the cylinders crossbeam and the column spacing, on constructional and economic grounds, as small and compact as possible, while taking into consideration the size of the billet-container, this passage of the rods and supporting of the forces could only be effected, on grounds of space, eccentrically to the axis of the crossbars and extrusion cylinders. This however give rise to additional bending moments, which call for a heavier, larger and therefore more expensive construction of the cylinder crossbeam.

It is the object of this invention, in a horizontal tube press or other extrusion press of four-column construction with four extrusion cylinders arranged between the columns with small column spacing, and with as small and compact a construction as possible to provide for the passage of the container-displacing rods, and for an appropriate support, free from bending moments, of the displacing cylinders.

This object is attained by providing, at the sides of the cylinder crossbeam at which the container-displacing rods extend, two extrusion cylinders allocated to these sides, of such a size that the remaining space between each individual cylinder and the adjacent columns is sufiicient to accommodate bores for the passage of the containerdisplacing rods through the cylinder crossbeam, whereas the two remaining cylinders, arranged at to the aforesaid cylinders, are of correspondingly larger dimensions, so as to obtain the aggregate extrusion force required by fully utilising the space betwen the columns.

Owing to this novel construction, not only the individual extrusion cylinders but also the displacing rods for the container, including the supports for the displacing cylinders, lie in one plane with the columns, so that additional moments, produced by tensile and compressive forces of the container-displacing means, acting on the individual crossbars or on the cylinder crossbeam as a whole, eccentrically to the lanes containing the axes of the columns, no longer occur. A further advantage consists in the possibility, owing to this arrangement and dimensioning of the cylinders, of making the press a multi-stage press.

In the case of piercing cylinders stationarily arranged behind the cylinder crossbeam, the supplying of the liquid pressure medium to the piercing cylinder and to the mandrel-retracting cylinders presents no special difficulties. In the case of a piercing cylinder movable behind the cylinder crossbeam and connected by rodding with the running crossbeam, however, a certain expenditure on design and construction is necessary for the feeding of the pressure fluid. Here the feeding is elfected by way of displacement tubes extending from the cylinder crossbeam.

In order to reduce this expenditure, therefore, in a further development of the invention, in a horizontal tubeextrusion press with piercing means arranged behind the cylinder crossbeam and connected by rodding with the running crossbeam, the stationary crossbars carrying the pressure-applying cylinders for the billet-container, which are supported on the cylinder crossbeam by way of rodding, are arranged behind the piercing-cylinder crossbar. On these crossbars, carrying the pressure-applying cylinders for the billet-container, are then arranged the displacement tubes for supplying pressure fluid to the piercing-cylinder and to the mandrel-retracting cylinders.

By this arrangement, in which the horizontally movable piercing-cylinder crossbar, connected by rodding with the running crossbeam, is located between and (as seen in the direction of extrusion) before the two stationary crossbars carrying the pressure-applying cylinders for the billetcontainer, and in which the stationary crossbars carry displacement tubes for the supply of pressure fluid to the piercing cylinders and to the mandrel-retracting cylinders, protection is in the .first place advantageously obtained not only for the piercing-cylinder crossbar, by the stationary pressure-applying crossbars, but also for the operating staff, against these movable part-s of the press. In the second place, by this arrangement pressure liquid is supplied in a far simpler manner than hitherto, and upon a substantially shorter and more reliable path.

One embodiment of the invention is illustrated by way of example in the accompanying drawings, in which:

FIG. 1 shows a view of a horizontal four-column tubeextrusion press with four extrusion cylinders in side elevation;

FIG. 2 shows a plan of the press;

FIG. 3 shows an end view of the press, as seen in the direction of the arrow A in FIG. 1; and

FIG. 4 shows a cross-section of the press as seen in the direction of the arrows B.

The press consists of a cylinder crossbeam 1 and a bolster 2, which are rigidly connected with one another by columns 3. In the cylinder crossbeam 1 are arranged four extrusion cylinders 4a and 4b, the pistons of which act upon a running crossbeam 5 and upon the press ram 6 mounted thereon. With the running crossbeam 5 is rigidly connected, by rods 7, a longitudinally displaceable piercing-cylinder crossbar 10, carrying a piercing cylinder 8 and mandrel-retracting cylinders 9. The piston of the piercing cylinder 8, and the pistons of the mandrelretracting cylinders 9, displace a piercing crossbar 11 connected with a piercing mandrel movable upon a slideway 12, upon which the piercing-cylinder crossbar also slides. The running crossbeam 5- is retracted, "by Way of the rods 7, by press-retracting cylinders 13, also mounted on the piercing-cylinder crossbar 10, with their piston-s 14, which bear directly on the extrusion cylinders 4a.

The billet-container 15 is rigidly connected by displacement rods 16 with billet-container displacing crossbars 17. The bores 18 in the cylinder crossbeam 1 for the passage of the displacing rod-s 16 are here located exactly in the vertical planes between the axes of the columns 3 and of the extrusion cylinders 4b. In the stationary billet-container crossbars 19 are arranged pressure-applying cylinders 20, the pistons 21 of which press the billetcontainer 15 against the die by way of the billet-container displacing crossbars 17 and the displacing rods 16. The supporting of the billet-container crossbars 19 is efiected by way of tension rods 22 secured to the cylinder crossbeam 1 co-axially with the columns 3. Retraction cylinders 23 mounted on the cylinder crossbeam 1 in the axis of the extrusion cylinders 4b eifect the retraction of the billet-container 15 from the die by way of the billet-container displacement crossbars 17.

On the stationary billet-container crossbars 19 are arranged displacement tube pistons 24, which are closed at one end and are provided on the long side with outlet slots. Upon these displacement tube pistons there slide displacement tube cylinders 25, which are mounted on the piercing-cylinder crossbar 10, the pressure fluid for the piercing-cylinder 8 and for the mandrel-retracting .4 cylinders 9 being supplied by way of the, stationary dis-. placement tube pistons 24 and the displacement tube cylinders 25 sliding over them.

I claim: 1. A horizontalextrusion press, comprising: a bolster, a cylinder crossbeam, four columns extending from the bolster to the cylinder crossbeam, four extrusion cylinders mounted in the cylinder crossbeam, each midway between two of the columns, two of the extrusion cylinders being of greater diameter than the other two, a displaceable billet-container, two container-displacing crossbars located behind the cylinder crossbeam, four containerdisplacing rods, two on each side of the press, extending through the cylinder crossbeam from the container-displacing crossbars to the billet-container, each between one of the smaller extrusion cylinders and an adjacent column.

2. A horizontal extrusion press as claimed in claim 1 for the extrusion of tubes, further comprising:

two stationary billet-container crossbars arranged behind the cylinder crossbeam, cylinders carried by the billet-container crossbars, displacing pistons slidable in the said cylinders and secured to the two container-displacing crossbars, tension rods supporting the stationary billet-container crossbars and secured to the cylinder crossbeam in axial alinement with the columns extending from the bolster to the cylinder crossbeam, and piercing means, comprising:

a displaceable piercing-cylinder crossbar arranged between the cylinder crossbeam and the stationary billet-container crossbars,

a running crossbeam, v

pistons slidable in the four extrusion cylinders and actuating the runnig crossbeam, and

rods rigidly connecting the running crossbeam with the piercing-cylinder crossbar. 3. A horizontal extrusion press for the extrusion of tubes as claimed in claim 2, further comprising:

mandrel-retracting cylinders and a piercing cylinder, all secured in the displaceable piercing-cylinder crossbar, displacement-tube pistons provided on the stationary billet-container crossbars, displacement-tube cylinders secured to the displaceable piercing-cylinder crossbar and slidable over the stationary displacement-tube pistons, each displacement-tube piston being formed with an outlet slot through which pressure fluid for admission to the piercing cylinder and to the mandrelretracting cylinders can be passed from the stationary displacement-tube pistons into the displacementtube cylinders.

UNITED STATES PATENTS 2,933,184 4/1960 Billen et. al. 72-265 3,350,911 11/1967 Groos 72265 LOWELL A. LARSON, Primary Examiner 

